ETPHY_CTRL
PHY_READ(sc, ETPHY_CTRL, ®);
PHY_WRITE(sc, ETPHY_CTRL, ETPHY_CTRL_DIAG | ETPHY_CTRL_RSV1);
PHY_WRITE(sc, ETPHY_CTRL, ETPHY_CTRL_RSV1);
PHY_READ(sc, ETPHY_CTRL, ®);
PHY_WRITE(sc, ETPHY_CTRL,
PHY_READ(sc, ETPHY_CTRL, ®);
PHY_WRITE(sc, ETPHY_CTRL, ETPHY_CTRL_RSV1);